将列表从Form3传递到Form1

Question

I have 3 forms: form1(which I want to use my List from form3 in which I create List and Add things to it), form2 ( which contains a button to go back to form1 and a button to go to form3 and get values to the list.

I tried creating the following class:

public class ListArticle
    {
        public List<string> Clothes { get; private set; }
        public List<string> Colors { get; private set; }

        public ListArticle()
        {
            Clothes = new List<string>();
            Colors = new List<string>();
        }
    }

and then declare trying Adding things in the List from form3 like this:

// This is the Declaration

public ListArticle _articles = new ListArticle();

    public ListArticle Articles
    {
        get
        {
            return _articles;
        }
        set
        {
            _articles = value;
        }
    }

This is how I add:

_articles.Clothes.Add("T-shirt " + tshirt_number.ToString());
_articles.Colors.Add(closestColor2(clist, color));

and this is how I am trying to get the values:

when I close form3

I do this:

Form2 frm = new Form2();
frm.Show();
Articles = _articles;
this.Hide();

in form2 I do nothing..

and in form1 I tried to do it like this:

//declaration

public ListArticle Articles;

public ListArticle _articles
{
   get
   {
     return Articles;
   }
   set
   {
     Articles = value;
   }
}

//and this is how I tried to do it but it returns null everytime.

private void button3_Click(object sender, EventArgs e)
    {
        try
        {
            Form3 f = new Form3();

            f.Articles = Articles;

            foreach (string c in Articles.Clothes)
            {
                MessageBox.Show(c);
            }
        }
        catch 
        {
            MessageBox.Show("Articles is null.");
        }

    }

Answer 1

If you want to be able to share the articles between all forms you could make the Clothes and Colors collection static:

public class ListArticle
{
    public static List<string> Clothes { get; private set; }
    public static List<string> Colors { get; private set; }

    static ListArticle()
    {
        Clothes = new List<string>();
        Colors = new List<string>();
    }
}

You can then add articles form one form like this:

ListArticle.Clothes.Add("T-shirt " + tshirt_number.ToString());
ListArticle.Colors.Add(closestColor2(clist, color));

...and retrieve articles from another form like this:

private void button3_Click(object sender, EventArgs e)
{
    try
    {
        foreach (string c in ListArticle.Clothes)
        {
            MessageBox.Show(c);
        }
    }
    catch
    {
        MessageBox.Show("Articles is null.");
    }
}

Using this approach you don't have to create any additional "article" properties in either of the forms. You just access the same static collections from all forms.